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Finding the Fourth Proportional to 66,535.20, 91,810.80 and 39,679.20

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Solution

The fourth proportional to 66,535.20, 91,810.80 and 39,679.20 is: 54,752.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,535.20 : 91,810.80 = 39,679.20 : x
  2. Step 2: Convert to fraction form
    66,535.20/91,810.80 = 39,679.20/x
  3. Step 3: Cross multiply
    66,535.20x = 91,810.80 × 39,679.20
  4. Step 4: Simplify right side
    66,535.20x = 3,642,979,095.36
  5. Step 5: Solve for x
    x = 3,642,979,095.36/66,535.20
  6. Step 6: Final answer
    x = 54,752.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.